Troubleshooting For Pole Detection Alarms With Rotary Motors - YASKAWA S-V Seres User Manual

12.6.1 Troubleshooting for Pole Detection Alarms with Rotary Motors

Alarm code
Detection Error
A.C50
Overtravel detection
A.C51
Detection uncompleted
A.C52
Out of range
A.C53
Detection Error2
A.C54
Cause
Parameter settings are incorrect.
Noise is present in the scale sig-
nal.
The motor is being subjected to
an external torque.
The resolution is rough.
The OT signal was detected.
Before the detection completes,
Servo ON signal was input.
The movement range during the
detection exceeds.
An external torque was applied.
12.6 Errors during Pole Detection Functionality
Countermeasure
The settings of the resolution and motor phase selection
(Pn080.1) may not be appropriate. Check the encoder speci-
fications and feedback signal conditions.
When the command during the detection is repeatedly output
several times in the same direction, noise may occur in the
scale signal, resulting in malfunction. Check the connection
to earth ground and the encoder cable.
The external torque prevents the SERVOPACK from execut-
ing the function.
• Reduce the external torque.
• If not possible, increase the value of speed loop gain
(Pn481).
The SERVOPACK cannot detect correct speed feedback.
• Use the recommended resolution.
• Alternatively, increase the value of command speed
(Pn493). However, the movement range will increase.
This alarm occurs when the OT signal is detected during the
function. Before executing the function, place the motor to
the position where the OT signal is not detected.
Analog Pulse Model
• Input the /P-DET signal.
MECHATROLINK and Network Option Model
• When using an absolute encoder, set Pn587.0 = 1 in order
to execute the function.
If the range (Pn494) has not been changed from default
value, the motor might have been moved for some reason.
Check for the cause and take proper measure.
• Increase the value of confirmation torque command
(Pn495).
• Increase the value of allowable error range (Pn498).
Note: Increasing the error range will also increase the motor
temperature.
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